Our school held a respect-parent activity last month our students benefited a lot.A. whe

问题补充：

Our school held a respect-parent activity last month, our students benefited a lot.

A. when

B. where

C. which

D. that

答案：

A. when

(答案→)B. where

C. which

D. that

解析：考查定语从句的关系词。先行词是a respect-parent activity，代入定语从句应是our students benefited a lot from the respect-parent activity，句子缺少地点状语，所以选B。